106 HISTORY OF BRITISH CRUSTACEA. 



and its teguments horny. The outer antennae are furnished 

 at the base with a very large plate, which conceals their 

 origin. The legs are for the most part slender and very 

 long, and the false swimming-feet are enveloped at the 

 base by the lamellar prolongation of the segments of the 

 abdomen. The tail-fin is large and well formed. This 

 group is very extensive in species, and includes the well- 

 known Shrimp and Prawn. 



Fam. CRANGONID^, M. Edto. 



Inner antennae inserted on the same line as the outer. 

 First pair of legs terminate in a subcheliform hand. (Plate 

 YIIT. fig. 2 a, shows inner antennae; fig. b, the outer.) 



The Arctic species of this family are much larger than 

 the others. In some of the northern seas, particularly in 

 the Bays of Spitsbergen, these Shrimps appear to abound, 

 and must supply food even to the walrus and seal. 



Gen. 38. CRANGOJNT, Fair. 



Carapace considerably depressed. First pair of legs 

 strong, ending in a flattened hand, on the front edge of 

 which there folds down a movable fang ; two next pairs of 

 legs very slender — the second generally ending in two small 



